MDCAT Chemistry MCQ #878

Why does atomic radius decrease across a period but increase down a group?

MDCAT Chemistry MCQ #878

  1. Question 1

    Q1. Why does atomic radius decrease across a period but increase down a group?

    • A) Effective nuclear charge decreases across a period
    • B) Electrons add to new shells down a group
    • C) Shielding increases across a period
    • D) Ionization energy decreases down a group

    Answer: Electrons add to new shells down a group

    Explanation: Down a group, electrons occupy higher energy shells. Option A is incorrect as effective nuclear charge increases across a period.